371  Ackermann Functions
Moderator: Board moderators
 mohiul alam prince
 Experienced poster
 Posts: 120
 Joined: Sat Nov 01, 2003 6:16 am
 Location: Dhaka (EWU)
371 can any body explain a good algorithm
hi
i am getting TLE again & again can any body explain a good algorithm
mohiul alam prince
i am getting TLE again & again can any body explain a good algorithm
mohiul alam prince
Last edited by mohiul alam prince on Thu Feb 17, 2005 3:04 pm, edited 1 time in total.
mohiul alam prince
ya i have seen that u are using double.
but stupid buddy i told about m & n.(where u r getting input)
they told input range will 32 bit integer.
so i told u to use unsigned long substitute of long.
like that>>>
scanf("%lu%lu", &m ,&n);
& mr sohel i can use unsigned long, which supports Turbo C++ && Visual C++.
so i'm not interested to use long long. long long only support in GCC.
but stupid buddy i told about m & n.(where u r getting input)
they told input range will 32 bit integer.
so i told u to use unsigned long substitute of long.
like that>>>
scanf("%lu%lu", &m ,&n);
& mr sohel i can use unsigned long, which supports Turbo C++ && Visual C++.
so i'm not interested to use long long. long long only support in GCC.
this time WA
what next...............?
what next...............?
algo of 371
i used same algo in 371 & 100.
different
special case 1. cycle length 3.
data type
for 100 int
for 371 unsigned long.
(cause input range is 32 bit integer)
hope u will get AC now
different
special case 1. cycle length 3.
data type
for 100 int
for 371 unsigned long.
(cause input range is 32 bit integer)
hope u will get AC now
this time WA
what next...............?
what next...............?
 alu_mathics
 Learning poster
 Posts: 55
 Joined: Sat Jan 24, 2004 9:30 pm
 Location: Chittagong
 Contact:
Three mistakes in a single program.
Mind it this is like 100 but not 100.
1. max = cycle(m);
x=m;
for(i=m+1;i<=n;i++) {
temp = cycle(i);
if (temp > max){
max = temp;
x=m; //No excuse.
}
}
2. The largest value in the sequence will not be larger than can be accomodated in a 32bit Pascal .
so u can use long long(%lld) or unsigned long(%lu) both for input
&& output && also temp.(or, change all data to lld or lu)
3.Between L and H, V generates the longest sequence of S values.
Where:
L = the lower boundary value in the sequence
H = the upper boundary value in the sequence
so print m && n even after swapping, not mOriginal,nOriginal.(does not match with 100)
Hope i am clear 2 u.
And don't forget to remove the code after u get AC
Mind it this is like 100 but not 100.
1. max = cycle(m);
x=m;
for(i=m+1;i<=n;i++) {
temp = cycle(i);
if (temp > max){
max = temp;
x=m; //No excuse.
}
}
2. The largest value in the sequence will not be larger than can be accomodated in a 32bit Pascal .
so u can use long long(%lld) or unsigned long(%lu) both for input
&& output && also temp.(or, change all data to lld or lu)
3.Between L and H, V generates the longest sequence of S values.
Where:
L = the lower boundary value in the sequence
H = the upper boundary value in the sequence
so print m && n even after swapping, not mOriginal,nOriginal.(does not match with 100)
Hope i am clear 2 u.
And don't forget to remove the code after u get AC
Last edited by alu_mathics on Thu Apr 01, 2004 7:39 pm, edited 1 time in total.
cuii e
 mohiul alam prince
 Experienced poster
 Posts: 120
 Joined: Sat Nov 01, 2003 6:16 am
 Location: Dhaka (EWU)
prince
prince u told u were getting TLE
so i told abt that.
well u r getting WA cos
for input
1 20
Between 1 and 20, 18 generates the longest sequence of 20 values.
20 1
Between 1 and 20, 18 generates the longest sequence of 20 values.
got it?
i hope u will AC now.
take care
so i told abt that.
well u r getting WA cos
for input
1 20
Between 1 and 20, 18 generates the longest sequence of 20 values.
20 1
Between 1 and 20, 18 generates the longest sequence of 20 values.
got it?
i hope u will AC now.
take care
this time WA
what next...............?
what next...............?

 New poster
 Posts: 8
 Joined: Tue Jun 15, 2004 7:16 pm
 Location: Chittagong, Bangladesh
 Contact:
Hi,
You solved 100 and 694, but TLE in 371! You can use same algorithm and code of 100, but think what will be output if input is 1 and 1. For this input loop will continue.
int cycle(long long m)
{
int i=0;
while(m!=1i==0) // see this condition
{
.........
}
return i;
}
in main():
if(temp>max_cycle)
{
max_value=i; //update this value, i from for loop
max_cycle=temp;
}
Another trick in this problem is smaller input alway first output:
input: 55 35 then output 35 55
input: 35 55 then the output also 35 55
Hope this will help u and soon it will be added in your solved problem.
I born to code
You solved 100 and 694, but TLE in 371! You can use same algorithm and code of 100, but think what will be output if input is 1 and 1. For this input loop will continue.
int cycle(long long m)
{
int i=0;
while(m!=1i==0) // see this condition
{
.........
}
return i;
}
in main():
if(temp>max_cycle)
{
max_value=i; //update this value, i from for loop
max_cycle=temp;
}
Another trick in this problem is smaller input alway first output:
input: 55 35 then output 35 55
input: 35 55 then the output also 35 55
Hope this will help u and soon it will be added in your solved problem.
I born to code
371:Ackermann Functions, Confusion
In the problem statement, it says:
"V = the first value that generates the longest sequence, (if two or more values generate the longest sequence then only show the lower value) S = the length of the generated sequence. "
In the next line: "In the event that two numbers in the interval should both produce equally long sequences, report the first."
Don't these two statements create a contradiction?
If the given range is like 5535, then should i report 55, or 54, as both generate the longest sequence.
Thank you!
"V = the first value that generates the longest sequence, (if two or more values generate the longest sequence then only show the lower value) S = the length of the generated sequence. "
In the next line: "In the event that two numbers in the interval should both produce equally long sequences, report the first."
Don't these two statements create a contradiction?
If the given range is like 5535, then should i report 55, or 54, as both generate the longest sequence.
Thank you!

 New poster
 Posts: 8
 Joined: Tue Jun 15, 2004 7:16 pm
 Location: Chittagong, Bangladesh
 Contact:
Hi,
Please read the two statements again that u write and also the whole problem . The both statements saying that from a given range u should print the lower one if two or more values generates same (longest) sequence. Suppose u are given to generate the range 55 35 then u proceed from 35 to 55 and again if u are given 35 55 then u also proceed from 35 to 55. So the lower or the first value is 54 not 55, isn't it?
Anyway don't think that u will not proceed from 55 to 35. But u should always think the value according to mathematical order to consider lower of first one: 0,1,2,3,.....,54,55,56,...............................
I hope this can help u if u need.
I born to code
Please read the two statements again that u write and also the whole problem . The both statements saying that from a given range u should print the lower one if two or more values generates same (longest) sequence. Suppose u are given to generate the range 55 35 then u proceed from 35 to 55 and again if u are given 35 55 then u also proceed from 35 to 55. So the lower or the first value is 54 not 55, isn't it?
Anyway don't think that u will not proceed from 55 to 35. But u should always think the value according to mathematical order to consider lower of first one: 0,1,2,3,.....,54,55,56,...............................
I hope this can help u if u need.
I born to code
371 gives T.L.E .Help me.
371 gives T.L.E . How Can I solve This Problem?Please Help
#include<stdio.h>
#include<stdlib.h>
long int max,m,d;
long int ALGORITHOM(long int n)
{
long int k=0;
m=n;
if(m==1)
d=1;
while(n!=1)
{
if ((n%2)!=0)
n=(3*n+1);
else
n=n/2;
k++;
}
if(max<k)
{
max=k;
d=m;
}
return 0;
}
int main ()
{
long int j,w,y,i,a,b;
while(1)
{
scanf("%ld %ld",&i,&j);
if(i==0&&j==0)
break;
if((i>0&&i<=2147483647)&&(j>0&&j<=2147483647))
{
a=i;
b=j;
w=(ji);
if(w<0)
w=abs(w);
for(y=0;y<=w;y++)
{
if(i<j)
{
ALGORITHOM(i);
i++;
}
else
{
ALGORITHOM(j);
j++;
}
}
printf("Between %ld and %ld, %ld generates the longest sequence of %d values\n",a,b,d,max);
max=0;
d=0;
}
else return 0 ;
}
return 0;
}
#include<stdio.h>
#include<stdlib.h>
long int max,m,d;
long int ALGORITHOM(long int n)
{
long int k=0;
m=n;
if(m==1)
d=1;
while(n!=1)
{
if ((n%2)!=0)
n=(3*n+1);
else
n=n/2;
k++;
}
if(max<k)
{
max=k;
d=m;
}
return 0;
}
int main ()
{
long int j,w,y,i,a,b;
while(1)
{
scanf("%ld %ld",&i,&j);
if(i==0&&j==0)
break;
if((i>0&&i<=2147483647)&&(j>0&&j<=2147483647))
{
a=i;
b=j;
w=(ji);
if(w<0)
w=abs(w);
for(y=0;y<=w;y++)
{
if(i<j)
{
ALGORITHOM(i);
i++;
}
else
{
ALGORITHOM(j);
j++;
}
}
printf("Between %ld and %ld, %ld generates the longest sequence of %d values\n",a,b,d,max);
max=0;
d=0;
}
else return 0 ;
}
return 0;
}

 New poster
 Posts: 22
 Joined: Fri Jan 17, 2003 8:24 am
Re: OH CRAP!
I'm using ... methodMAXX^FACTOR wrote:your method is too slow .............and "TIMELIMITEXCEEDED" is happened
OH! CRAP~~~~~~
typedef struct{
int low,high;
int Number,Sequence;
} Data;
Data Buff[1000];
I save all in buff and the counting it. It's more fast.
Another trick : 3*n+1 > but the limit is integer so you must use long long or long double in this case.
Hope my solution acceptable. and yours too
371 Akerman TLE is denied now why WA
I am a student Of Jinnah University Pakistan I have been
trying to solve the Problem "Akerman" prob#371
I have been getting time limit execede Error
Plz Tell Me the error In MY code
Thanks in advance for your help.. and plz reply
Problem Akerman
# 371
TLE
#include<iostream>
using namespace std;
int AckermennFunction(int val);
//8589934591
void main()
{
int x=0;int y=0;
cin>>x;cin>>y;
while(x!=0 && y!=0) {
int MAX=1;int i=0;
for(int t=x;t<=y;t++)
{
int temp=AckermennFunction(t);
if(temp>MAX){MAX=temp;i=t;}
}
cout<<"Between "<<x<<" and "<< y<<", "<<i<<" generates the longest sequence of "<<MAX <<" values.\n";
cin>>x;cin>>y;
}
}
int AckermennFunction(int val)
{
// All the Odd Numbers Have Least Significient Bit==1
int count=0;
do
{ count++;
if(val%2==0){ val = val/2;}
else{val = 3*val+1;}
}while(val!=1);
return count;
}
trying to solve the Problem "Akerman" prob#371
I have been getting time limit execede Error
Plz Tell Me the error In MY code
Thanks in advance for your help.. and plz reply
Problem Akerman
# 371
TLE
#include<iostream>
using namespace std;
int AckermennFunction(int val);
//8589934591
void main()
{
int x=0;int y=0;
cin>>x;cin>>y;
while(x!=0 && y!=0) {
int MAX=1;int i=0;
for(int t=x;t<=y;t++)
{
int temp=AckermennFunction(t);
if(temp>MAX){MAX=temp;i=t;}
}
cout<<"Between "<<x<<" and "<< y<<", "<<i<<" generates the longest sequence of "<<MAX <<" values.\n";
cin>>x;cin>>y;
}
}
int AckermennFunction(int val)
{
// All the Odd Numbers Have Least Significient Bit==1
int count=0;
do
{ count++;
if(val%2==0){ val = val/2;}
else{val = 3*val+1;}
}while(val!=1);
return count;
}
 alu_mathics
 Learning poster
 Posts: 55
 Joined: Sat Jan 24, 2004 9:30 pm
 Location: Chittagong
 Contact:
i hope you have change ur datatype to unsigned long or long long or __int64.
consider the case
2147483647 2147483647
then you can get overflow.
coz 2147483647*3+1 is out of range of int(long) indeed.
input can be
12 10
so swap them and thus you can avoid tle.
remember the word "between" all the time.atleast i do.
consider the case
2147483647 2147483647
then you can get overflow.
coz 2147483647*3+1 is out of range of int(long) indeed.
input can be
12 10
so swap them and thus you can avoid tle.
remember the word "between" all the time.atleast i do.
cuii e